For analysing how the presence of an AGN may affect the different morphological parameters
and hence the final morphological classification of active galaxies, we used the
selected sample of star-forming (non-AGN) galaxies and simulated AGN hosts
by adding in their centers different AGN contributions. For simulating
the AGN contribution, for each galaxy we used its corresponding point
spread function (PSF) image in the g-band obtained from the SDSS database
[1]}. To model the PSF we used the Moffat
function [2]}, which showed to be its good analytical
approximation [3]}, [4]}. For each galaxy we
constructed five simulated images using different fractions of AGN
contribution to the total galaxy flux: 5%, 10%, 25%, 50%, and
75%. The total galaxy flux was measured by running SExtractor
code on the g-band images. Once we obtained simulated images of galaxies
with the different AGN contributions added we repeated the steps from
Sec. REF . We first run SExtractor on all simulated images to
obtain the different input parameters needed for measuring the morphological
parameters. Secondly, for each AGN contribution of 5% - 75% we
measured the six morphological parameters following the procedure in Sec. REF .
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